<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
    function Foo(){
        getName=function(){alert(1)}
        return this
    }
    Foo.getName=function(){alert2}
    Foo.prototype.getName=function (){alert(3);}
    var getName=function(){alert(4)}
    function getName(){alert(5)}
    // new Foo().getName()
    new new Foo().getName()

</script>
</html>